Which of the following are examples of plagiarism?
a. Citing sources only in the references page but not in the text of a paper.
b. Presenting the exact words of a source without placing them within quotation marks.
c. Paraphrasing a source by using a thesaurus to find replacements for a few of the words.
d. Re-using your own work from a previous class without the permission of your instructor.
e. Asking a friend to proofread your paper for grammar and spelling mistakes.